Iron core reactor and 35kV cascade type high-voltage direct-hanging energy storage device

Abstract

The utility model provides an iron core reactor and a 35kV cascade type high-voltage direct hanging energy storage device. The iron core reactor comprises three iron core columns and two iron yokes, the two iron yokes are horizontally arranged up and down, the three iron core columns are vertically arranged between the two iron yokes, each iron core column is sleeved with a high-voltage coil, the top end of each iron core column is provided with a lead assembly of the corresponding high-voltage coil, and each iron yoke is of a linear structure. And the horizontal sectional area of each iron core column is smaller than the projection area of the iron yoke on the iron core column. According to the iron core reactor, the problems that an air-core reactor is large in occupied space and large in magnetic leakage are solved, compared with a conventional iron core reactor, the alignment process between the iron core columns and the iron yokes is omitted, and the installation period is shortened. According to the 35kV cascade type high-voltage direct-hanging energy storage device, the iron core reactor and other energy storage equipment are integrated in one container, so that the installation space is saved, the site selection requirement of an energy storage power station is reduced, the station building period is shortened, and the station building cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an iron core reactor and a 35kV cascade type high voltage direct-mounted energy storage device. Background Art

[0002] Renewable energy generation and the smart grid industry account for an increasingly larger share of electricity consumption in various industries, and energy storage technology is the key to continuous, adjustable and stable renewable energy generation.

[0003] At present, the reactors used for grid-connected 35kV cascade high-voltage direct-mounted energy storage devices are generally air-core reactors due to their large capacity and high voltage. They occupy a large space, have large magnetic leakage, and are prone to electromagnetic interference to surrounding equipment, which places higher requirements on the site selection of energy storage power stations. Utility Model Content

[0004] On the one hand, the present application proposes an iron core reactor, which is used to solve the problems of large space occupation and large magnetic leakage of air core reactors, and simplifies the installation process of conventional iron core reactors and shortens the installation period.

[0005] On the other hand, the present application proposes a 35kV cascade high-voltage direct-mounted energy storage device, which is used to save installation space, reduce the siting requirements of energy storage power stations, shorten the station construction period and reduce the station construction cost.

[0006] According to the first aspect of the present application, the iron core inductor proposed in the present application includes three iron core columns and two iron yokes, the two iron yokes are placed horizontally up and down, and the three iron core columns are placed vertically between the two iron yokes, a high-voltage coil is sleeved on the outside of each iron core column, and a lead assembly of the high-voltage coil is arranged on the top, wherein the iron yoke is a straight-line structure, and the horizontal cross-sectional area of ​​each iron core column is smaller than the projection area of ​​the iron yoke at the iron core column.

[0007] Preferably, the core column comprises two core end columns, a plurality of discus and a plurality of air gap plates, and the core end columns and the discus are separated from each other and between two upper and lower adjacent discus by the air gap plates.

[0008] Further preferably, the core column is covered with an insulating tube as an outer mold, and epoxy resin is poured into the insulating tube and then cured to form a whole with the core column. The thickness of the insulating tube is 1.5 mm.

[0009] The entire upper and lower structures of the core column are fastened between the two iron yokes through a central through-pull rod; the iron yoke is formed by stacking silicon steel sheets front and back and fastened by an insulating drawstring.

[0010] Wherein, the discus is a radial discus, which is formed by stacking a number of radial silicon steel sheets.

[0011] Wherein, an air gap plate is arranged at the contact point between the iron yoke and the iron core end column.

[0012] Optionally, an epoxy resin layer is cast outside the high-voltage coil sleeved by each core column, the epoxy resin layer seals the high-voltage coil as a whole, and isolation plates are arranged between the high-voltage coils.

[0013] Optionally, each high-voltage coil sleeved on the core column has two lead connectors respectively connected to the lead assembly to meet the two-speed switching of the reactance rate of the reactor.

[0014] According to the second aspect of the present application, the 35kV cascade type high-voltage direct-mounted energy storage device proposed in the present application includes the aforementioned iron core reactor and other energy storage equipment, and the iron core reactor and other energy storage equipment are integrated in a container for the 35kV cascade type high-voltage direct-mounted energy storage device to be connected to the grid.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] The iron-core inductor proposed in the present application, on the one hand, compared with the hollow-core inductor, can significantly reduce the space occupied and the leakage magnetic field due to the iron core column and the iron yoke; on the other hand, compared with the conventional iron-core inductor, the iron yoke of the present application adopts a straight-line structure, and the horizontal cross-sectional area of ​​each iron core column is smaller than the projection area of ​​the iron yoke at the iron core column. Therefore, compared with the iron yoke of the mountain-shaped structure of the conventional iron-core inductor, when assembling the iron core column with the straight-line iron yoke, the present application reduces the alignment process between the iron core column and the iron yoke, simplifies the installation process of the conventional iron-core inductor, and shortens the installation period.

[0017] The 35kV cascade type high-voltage direct-mounted energy storage device proposed in this application can be integrated with other energy storage equipment in a container because the iron core reactor significantly reduces the space occupied and the leakage magnetic field compared to the air core reactor. This greatly saves the installation space of the 35kV cascade type high-voltage direct-mounted energy storage device, reduces the site selection requirements of the energy storage power station, and thus shortens the station construction period and reduces the station construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are only used to illustrate specific embodiments and are not considered to be limiting of the present application. In the entire drawings, the same reference symbols represent the same components. In the drawings:

[0019] Figure 1 This is a schematic diagram of the assembly of the iron core reactor proposed in this application;

[0020] Figure 2 This is a schematic diagram of the structure of the iron core column and the iron yoke in the iron core reactor proposed in this application;

[0021] Figure 3 It is a projection diagram of the iron core column and the iron yoke after being assembled in the iron core reactor proposed in this application;

[0022] Figure 4 This is a schematic plan view of the discus in the iron-core reactor proposed in this application.

[0023] In the figure, 1 is the iron core column; 2 is the high-voltage coil; 3 is the lead assembly; 4 is the base; 5 is the fan; 6 is the iron yoke; 7 is the iron core end column; 8 is the discus; 9 is the air gap plate; 10 is the through-pull rod; and 11 is the insulating pull tape. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0025] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] According to the first aspect of the present application, embodiment 1 of the present application proposes an iron core reactor, see Figure 1-Figure 4 As shown, it includes three core columns 1 and two iron yokes 6, the two iron yokes 6 are placed horizontally up and down, and the three core columns 1 are placed vertically between the two iron yokes 6. The outside of each core column 1 is provided with a high-voltage coil 2, and the lead assembly 3 of the high-voltage coil 2 is provided at the top. Other accessories such as a foot 4 and a fan 5 are also provided at the bottom of each core column 1. Compared with the air-core reactor, the iron core reactor of the present application can significantly reduce the occupied space and leakage magnetic field due to the iron core column and iron yoke.

[0028] The iron yoke 6 of the present application is a straight-line structure, and the horizontal cross-sectional area of ​​each core column 1 is smaller than the projection area of ​​the iron yoke 6 at the core column 1 .

[0029] Specifically, see Figure 3The top view of the iron yoke and the iron core column after assembly is shown, the dotted circle is the top view of the iron core column 1, and the solid horizontal line is the top view of the iron yoke 6. The overlapping area of ​​the two projections is the contact area of ​​the two, that is, the horizontal cross-sectional area of ​​the iron core column. Since the projection of the solid line completely covers the area of ​​all the dotted circles, it can be seen that the horizontal cross-sectional area of ​​the iron core column is smaller than the projection area of ​​the iron yoke 6 at the iron core column 1. The purpose of this design is to ensure that the actual contact area between the two is not less than the cross-sectional area of ​​the iron core column, so that when the iron core column is assembled with the straight iron yoke, it is convenient to align the iron core column with the iron yoke plane. Compared with the mountain-shaped iron yoke of the conventional iron core reactor, the present application reduces the alignment process of the iron core column and the iron yoke plane, simplifies the installation process of the conventional iron core reactor, and shortens the installation period.

[0030] See also Figure 2 As shown, according to some embodiments of the present application, the core column 1 includes two core end columns 7, a plurality of discus 8 and a plurality of air gap plates 9, and the core end column 7 and the discus 8, and two upper and lower adjacent discus 8 are separated by the air gap plates 9. By designing the core column 1 into a multi-section structure, adding air gap plates between every two sections, and using the air gap plates to change the magnetic flux rate so that the reactance value can be changed, the magnetic saturation of the core column can be avoided, and the additional loss of the core column can be reduced.

[0031] According to some embodiments of the present application, the core column 1 is covered with an insulating tube as an outer mold, and epoxy resin is poured into the insulating tube and then cured into one with the core column 1. Preferably, the thickness of the insulating tube is 1.5 mm, which will not significantly increase the cross-sectional area of ​​the core column 1. Using the insulating tube as an outer mold, on the one hand, can enhance the insulation strength between the high-voltage coil 2 and the core column 1, reduce the main air channel distance between the two, and thus reduce the overall size of the reactor; on the other hand, it can facilitate the assembly of multiple discus 8 and the core end column 7, ensure the concentricity of multiple discus 8, and reduce the difficulty of assembling the core column 1 as a whole with the iron yoke 6. In addition, by pouring epoxy resin into the insulating tube and sealing all the core column components with epoxy resin, the vibration caused by magnetostriction between the core column components is greatly reduced, and the operating noise of the core reactor is reduced.

[0032] See also Figure 2 As shown, according to some embodiments of the present application, the upper and lower structures of the entire core column 1 are fastened between two iron yokes 6 through a central through-pull rod 10; the iron yoke 6 is made of silicon steel sheets stacked front and back and fastened by an insulating drawstring 11. By fastening the iron yoke 6 and the core column 1 separately, the structures of the various components of the iron core reactor are made more compact, reducing the operating noise of the iron core reactor.

[0033] According to some embodiments of the present application, see Figure 4As shown, the discus 8 is a radial discus, which is formed by a plurality of radial silicon steel sheets. The outermost ring of the discus 8 is fastened by a binding band, and a grounding plate is provided for grounding the discus 8. The use of the radial discus reduces the phenomenon that the transverse leakage flux of the core column at the non-magnetic gap vertically passes through the plane of the silicon steel sheet, thereby greatly reducing the additional loss of the discus 8.

[0034] According to some embodiments of the present application, an air gap plate is provided at the contact between the iron yoke 6 and the iron core end column 7. The use of the air gap plate can also reduce the additional loss at the contact between the iron core column 1 and the iron yoke 6.

[0035] According to some embodiments of the present application, an epoxy resin layer is cast outside the high-voltage coil 2 sleeved by each core column, and the epoxy resin layer seals the high-voltage coil as a whole, and an isolation plate is provided between the high-voltage coils 2. The high-voltage coil 2 is fully enclosed by epoxy resin layer casting, and isolation plates are provided to isolate each other, which can greatly improve the insulation strength of the high-voltage coil, reduce electromagnetic vibration during the operation of the iron core reactor, and reduce noise.

[0036] According to some embodiments of the present application, each core column sleeve high-voltage coil 2 has two lead connectors respectively connected to the lead assembly 3 to meet the two-speed switching of the reactor reactance rate. For example, the reactor reactance rate has two taps of 15% and 10%, which can meet the two-speed switching.

[0037] To summarize, the iron-core reactor proposed in the present application, on the one hand, compared with the hollow-core reactor, can significantly reduce the space occupied and the magnetic leakage due to the iron core column and the iron yoke; on the other hand, compared with the conventional iron-core reactor, the iron yoke of the present application adopts a straight-line structure, and the horizontal cross-sectional area of ​​each iron core column is smaller than the projection area of ​​the iron yoke at the iron core column. Therefore, compared with the iron yoke of the mountain-shaped structure of the conventional iron-core reactor, when assembling the iron core column with the straight-line iron yoke, the present application reduces the alignment process between the iron core column and the iron yoke, simplifies the installation process of the conventional iron-core reactor, and shortens the installation period.

[0038] Example 2

[0039] According to the second aspect of the present application, Example 2 of the present application proposes a 35kV cascade-type high-voltage direct-hanging energy storage device, including the iron core inductor of the aforementioned Example 1 and other energy storage equipment, and the iron core inductor and other energy storage equipment are integrated in a container for grid-connected use of the 35kV cascade-type high-voltage direct-hanging energy storage device.

[0040] The 35kV cascade type high-voltage direct-mounted energy storage device proposed in this application can be integrated with other energy storage equipment in a container because the iron core reactor significantly reduces the space occupied and the leakage magnetic field compared to the air core reactor. This greatly saves the installation space of the 35kV cascade type high-voltage direct-mounted energy storage device, reduces the site selection requirements of the energy storage power station, and thus shortens the station construction period and reduces the station construction cost.

[0041] Finally, it should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion. Without further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of additional identical elements in the process, method, product or equipment that includes the elements.

[0042] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments. In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

Claims

1. An iron core reactor, comprising three iron core columns and two iron yokes, wherein the two iron yokes are placed horizontally up and down, and the three iron core columns are placed vertically between the two iron yokes, and each iron core column is provided with a high-voltage coil on the outside, and a lead wire assembly of the high-voltage coil is provided at the top, characterized in that: The iron yoke is a straight-line structure, and the horizontal cross-sectional area of ​​each iron core column is smaller than the projection area of ​​the iron yoke on the iron core column.

2. The iron core reactor according to claim 1, characterized in that: The core column comprises two core end columns, a plurality of discuses and a plurality of air gap plates. The core end columns and the discuses and two upper and lower adjacent discuses are separated by the air gap plates.

3. The iron core reactor according to claim 2, characterized in that: The core column is covered with an insulating tube as an outer mold, and epoxy resin is poured into the insulating tube and then solidified to form a whole with the core column.

4. The iron core reactor according to claim 3, characterized in that: The thickness of the insulating tube is 1.5 mm.

5. The iron core reactor according to claim 3, characterized in that: The entire upper and lower structures of the core column are fastened between the two iron yokes through a central through-pull rod; the iron yoke is formed by stacking silicon steel sheets front and back and fastened by an insulating drawstring.

6. The iron core reactor according to claim 3, characterized in that: The discus is a radial discus, which is formed by laminating a plurality of radial silicon steel sheets.

7. The iron core reactor according to claim 3, characterized in that: An air gap plate is arranged at the contact point between the iron yoke and the iron core end column.

8. The iron core reactor according to claim 3, characterized in that: An epoxy resin layer is poured outside the high-voltage coil sleeved on each core column, and the epoxy resin layer seals the high-voltage coil as a whole, and an isolation plate is arranged between the high-voltage coils.

9. The iron core reactor according to claim 3, characterized in that: Each high-voltage coil sleeved on the core column has two lead connectors respectively connected to the lead assembly to meet the two-speed switching of the reactance rate of the reactor.

10. A 35kV cascade type high voltage direct hanging energy storage device, characterized in that: It comprises the iron core reactor as claimed in any one of claims 1 to 9 and other energy storage devices, wherein the iron core reactor and other energy storage devices are integrated in a container and used for grid-connected use of the 35kV cascade high-voltage direct-mounted energy storage device.

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